諧振寬頻氣泡屏幕對船艦螺槳訊號之影響量測分析

船艦遭受敵方潛艦及音響水雷威脅，主要由於其螺槳水中所發出之振動及噪聲，而其來源及成因甚多且複雜。若能產生有效干擾螺槳所發出之水中噪聲，則可減少船艦遭受敵方之偵測及攻擊，並提供海軍從事相關訓練、模擬、作戰及欺敵等功用。本研究乃針對一寬頻帶混合確定及隨機訊號之氣泡屏幕，對於船艦螺槳所發出之水中噪聲，在諧振頻率區域所造成之影響加以測試分析。比較之訊號，包括兩組水中麥克風訊號接收之頻譜及時域函數特性，包括自頻譜、互頻譜、自相關函數、互相關函數、訊噪比與相通函數等及振幅機率分析其密度分布與累積機率分布。經由不同錄音過程及處理後，接收訊號分析加以比對。錄音分析之結果，在一般船艦噪聲模擬時，可增進對水中聲訊處理及分析之相關技術，以建立一有效氣泡屏幕評估及降低船艦螺槳所發出之水中噪聲方法。

關鍵字

水中聲響；氣泡屏幕降低船艦螺槳噪聲訊號分析

並列摘要

The threats from the acoustic mines to the ships are mainly from their underwater acoustic noise, since the sounds are complicated coupled and come from many sources. In order to establish a feasible way to avoid the attacks from the acoustic mines, the decoys have to produce a similar ship's underwater sounds. This study emphasized on the measurements and analysis of a combined deterministic and random bubble screen to a model ship propeller harmonics low frequency ranges noise. The measurements were taken by two hydrophones at different locations in a reverberation tank, the signals were sampled by a digital tape recorder and replayed by an underwater speaker. The time and frequency domain signal functions such as autospectrum, crossspectrum, autocorrelation, cross correlation, signal to noise ratio, coherence, probability density function, cumulative probability distribution were compared with the original source sounds. The autospectrum and crossspectrums shown that bubble screen have good effects in lowering the measuring propeller underwater noise amplitudes. The experience gained in the study can help processing technology of the real ship's sound simulation.

並列關鍵字

Propeller Underwater Sounds ； Bubble Screen Harmonic Propeller Noise Analysis

國際替代計量

諧振寬頻氣泡屏幕對船艦螺槳訊號之影響量測分析

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